JP2000033609A - Platelike or blocking product-molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the productivity of a molding device for platelike or blocklike products and upgrade the precision of the device by molding powder packed in a treatment chamber which is internally sectioned with plural planar parts and a rubber mold located on the outer periphery of a mandrel, under an isotropic pressure through the rubber mold. SOLUTION: This molding device 1 is equipped with a cylindrical pressure container 3 with a pressure medium introduction/discharge aperture 2, an upper and a lower punch 6, 7 to be fitted, in a freely introducible and detachable manner, into an upper and a lower lid 4, 5 and a pressure rubber mold 8 and a molding rubber mold 9 which are of a double cylindrical shape and are mounted n the pressure container 3. In addition, a metallic mandrel 10 which is freely introducible into and detachable from a treatment chamber encircled with the rubber mold 9 and the upper and the lower punch 6, 7 and is implanted in the lower punch 7, has a planar part 12 formed at two or more stops on the outer periphery. Further, a platelike or a blocklike treatment chamber 13 is defined at two or more spots with the planar part 12 and the rubber mold 9. Powder 14 of metal, ceramics or the like packed in the treatment chamber 13 is molded under an isotropic pressure through the rubber mold 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for forming a plate-shaped or block-shaped product, and more specifically, to a rubber press (dry CIP) having a mandrel.
The present invention relates to an apparatus for obtaining a plurality of plate-shaped or block-shaped products by a single pressurization process.

[0002]

2. Description of the Related Art There is a cold isostatic pressing (CIP) molding method as one of pressure compression molding of powders of metals, ceramics and the like. It is separated from the molded body by the rubber separator and has the advantage that the pressurized medium does not adhere when handling the molded body,
It is known in Japanese Utility Model Laid-Open Publication No. Sho 62-198230 (conventional example 1) and Japanese Patent Laid-Open No. 1-154707 (conventional example 2).

[0003]

In the first conventional example, it is possible to form a large number of plate-shaped or block-shaped molded products (plate-shaped or block-shaped products) by one pressing process. There were challenges. (1); Since the molded body contact surfaces are all rubber or soft film partitioning materials, the dimensional accuracy of the molded body (particularly the flatness as a plate material) is poor, so that the machining cost is increased and the product yield is increased. It was getting worse.

[0004] (2) Since the molding dies are stacked in multiple stages, it is necessary to mount a rubber mold and a partition material every time the powder is filled, resulting in low productivity. (3): For the same reason as in (2) above, it took time to handle the molded body. The second conventional example is a multi-layer molding technique for a plate-like product or a cylindrical product, and has the following problems.

(1): Only one product can be molded per mold, and the productivity is low. (2): Since all surfaces except the one surface (rubber portion) contacting the powder are molds, burrs, that is, elephant foot phenomena occur on the upper and lower sides of the molded body, which causes a flack at the time of firing. And handling was also difficult.

(3); unevenness is likely to occur in the packing density of the powder,
If the thickness of the mold (side surface) is small, the mold may bend and deform during the pressurization process. To prevent this, the mold has a certain rigidity (thickness). However, when the size (size) of the molded body becomes large, the weight becomes excessively large and handling becomes difficult. The present invention solves the above-mentioned problems of the prior art by a rubber press (dry CIP) having a mandrel (mandrel), and achieves high productivity (multiple pieces, powder filling, etc.).
It is an object of the present invention to provide an apparatus for forming a plate-shaped or block-shaped product which can be easily handled and can be highly accurate (flatness of the plate-shaped or block-shaped product, good shape).

Here, the plate-shaped product means a plate material having a rectangular cross section, a curved cross section, a half-moon shape or the like, and the block-shaped product means a member having a high ratio of thickness to length and width.

[0008]

The present invention employs the following technical means to achieve the above-mentioned object. That is, the plate-shaped or block-shaped product molding apparatus according to claim 1 includes a mandrel that can be inserted into and removed from a processing chamber surrounded by a rubber mold and upper and lower punches, and two or more flat surfaces are provided on the outer periphery of the mandrel. Part, and the flat part and the rubber mold
A plate-shaped or block-shaped processing chamber is defined at two or more locations, and the powder filled in the plate-shaped or block-shaped processing chamber is subjected to isostatic pressing through a rubber mold. is there.

By adopting such a configuration, 1
A plurality of plate-shaped or block-shaped products can be pressure-formed by multiple pressing processes, and the flat part of the plate-shaped or block-shaped product is flat because the flat part of the mandrel functions as a mold and is easily deformed. This improves the degree of filling and facilitates powder filling by the inline method (with the upper punch removed).

According to a second aspect of the present invention, in the configuration of the first aspect, the flat portion formed on the outer periphery of the mandrel has a curved surface shape or a groove shape. By adopting such a configuration, the cross-sectional shape of the plate-shaped or block-shaped product can be easily formed into a rectangular shape, a curved shape, a half-moon shape (including a three-month shape).

Further, according to the third aspect of the present invention, in the configuration of the first or second aspect described above, the contact portion of the upper and lower punches with one or both of the powders is constituted by an elastic spacer. By adopting such a configuration, the powder (powder) such as metal or ceramics comes into contact with the elastic material (rubber) except for the flat part of the mandrel during the pressing process. As a result, burrs (elephant foot phenomenon) are unlikely to occur at the end of the molded product (plate-like or block-like product), so that cracks can be prevented during firing in a later step and handling properties are improved. .

According to a fourth aspect of the present invention, in the above-described first to third aspects, the mandrel has a downwardly tapered shape with a large diameter. By adopting such a configuration, when the mandrel is extracted from the rubber mold after the pressure molding and when the mandrel is handled (transferred) after the extraction, the falling of the molded body can be prevented by the tapered shape. (Transfer to the next step, etc.) can be easily performed unmanned.

Further, the present invention according to claim 5 is characterized in that, in the constitution of claims 1 to 4, the mandrel together with the rubber mold and the lower punch can be inserted into and removed from the processing chamber. By adopting such a configuration, the supply and filling of powder into the plate-like or block-like processing chamber can be performed in an off-line system (filling of powder at a position different from the pressure vessel). And the like, the packing density can be improved, and therefore the quality of plate-like or block-like products can be expected to be improved.

By attaching the mandrel to the lower punch so as to be detachable (convertible), other components can be used for the pressure molding of the cylindrical molded body and the pressure molding of the plate-shaped or block-shaped product using the mandrel. (Rubber mold, pressure vessel, upper / lower punch, etc.) can be shared.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, a plate-shaped or block-shaped product forming apparatus (dry CIP apparatus) according to the present invention will be described below.
An embodiment will be described. FIG. 1 (A) (B) (C)
(D) shows the first embodiment. In FIG. 1 (A), the molding apparatus 1 introduces / discharges a pressurized medium (water, oil, emulsion liquid to which a rust preventive lubricant is added, ethylene glycol, etc.). A cylindrical pressure vessel 3 having an outlet 2, an annular upper lid 4 and a lower lid 5 fitted and fixed to upper and lower openings of the pressure vessel 3, and inserted into the upper and lower lids 4, 5. Upper and lower punches 6 and 7 which are detachably fitted, a double cylindrical pressurized rubber mold 8 and a molded rubber mold 9 mounted in the pressure vessel 3.
(Hereinafter simply referred to as a rubber mold 9), a metal mandrel 10 provided in the lower punch 7 so as to be freely inserted into and removed from a processing chamber surrounded by the rubber mold 9 and the upper and lower punches 6, 7.
The upper and lower punches 6 and 7 are mainly constituted by a press frame 11 which is detachably engageable with end faces 6A and 7A and bears an axial force at the time of isostatic pressing by a pressure medium.

Although not shown, the pressure medium introducing / discharging port 2 is provided with a pressure generating unit (combination of a piston, a cylinder and a check valve) and a pressure reducing mechanism. The mandrel 10 has two or more (two opposed to each other in the figure) flat portions 12 formed on the outer periphery thereof. The flat portion 12 and the rubber mold 9 form two or more plate or block shapes. A processing chamber 13 is defined, and a powder 14 of metal, ceramics, or the like filled in the processing chamber 13 is configured to be pressed under isostatic pressure through a rubber mold 9.

The upper punch 6 is formed with a positioning recess 6B for the mandrel 10 at the center thereof, and the upper end of the mandrel 10 is removably inserted into the recess 6B. Contact portion 15 with powder through
Are formed. A mandrel 10 is erected on the lower punch 7 so as to be detachable, and a peripheral portion of the lower punch 7 below the mandrel 10 has a contact portion 16 with powder through a step.
The lower punch 7 allows the mandrel 10 to be freely inserted into and removed from the processing chamber by a lifter device or the like (not shown) with the mandrel 10 standing upright.

The operation of the first embodiment described above will be described. When the mandrel 10 is inserted and set using a lifter device or the like in a state where the press frame 11 is detached, the processing chambers 13 are defined at two opposing locations in the figure. Then, the upper punch 6 is pulled out, and the powder 14 is filled from the upper side of the processing chamber 13. When the filling is completed, the upper punch 6 is fitted to the upper lid 4, the concave portion 6 </ b> B is covered on the mandrel 10, and the press is performed. The frame 11 is attached to the end faces 6A, 7 of the upper and lower punches 6, 7.
A, where the pressurization preparation is completed.

When the pressure medium from the pressure generating unit is introduced into the pressure vessel 3 through the introduction / discharge port 2, the powder 14 filling the processing chamber 13 via the rubber mold 9 becomes isotropic. Pressure molding (compression molding) is performed by pressure, and the axial force at this time is carried by the press frame 11. When the pressure molding by the predetermined isotropic pressure is completed, the pressure is reduced to restore the rubber mold 9 (expanded diameter), the press frame 11 is detached, and the lower punch 7 is pulled out by a lifter device or the like.
As shown in FIGS. 1 (B) and 1 (C), two plate-shaped or block-shaped products 17 formed by compressing powder as shown in FIGS.
Thereby, the flatness is improved.

The product 17 is handled in a subsequent step (for example, a baking step) or the like, and the product 17 is released (release).
The mandrel 10 is connected to the pressure vessel 3 via a lifter device or the like.
Is reset to FIG. 2 shows a second embodiment of the molding apparatus according to the present invention.
This is an embodiment in which elastic spacers 18 and 19 such as rubber are attached as upper and lower contact portions.
Since the operation is basically the same as that of the above-described first embodiment, common portions are denoted by common reference numerals.

In the second embodiment, when the powder 14 filled in the processing chamber 13 is pressurized under isotropic pressure, when the upper and lower contact portions are made of metal, the contact portions 15 and 16 do not shrink. Since there is a possibility that burrs (elephant foot phenomenon) may occur, mounting of the elastic spacers 18 and 19 prevents the elephant's foot from occurring, thereby facilitating the handling operation. In addition to eliminating the cause of cracking during sintering, it also prevents the yield of powdered materials from decreasing.

Therefore, the elastic spacers 18 and 19 are desirably mounted vertically as shown in the figure, but may be mounted on one of the upper and lower sides. 3 and 5 (A)
As apparent from FIG. 5B, the plane portion 12 formed on the mandrel 10 may have a curved surface shape as shown in FIG. 3 and a groove shape as shown in FIG. 5B. As shown in FIG. 5A, two or more locations (four locations in the figure) can be formed.

In the illustrated example, the plane portion 12 is formed over the entire length of the mandrel 10 in the axial direction.
A plurality (managed in the circumferential direction) may be formed at intervals in the axial direction of the mandrel 10. However, when the plane portions are formed at intervals in the axial direction, the filling of the powder is somewhat difficult, but this can be avoided by tapping or the like.

FIG. 4 shows a main part of a third embodiment of the molding apparatus according to the present invention, in which the mandrel 10 is formed in a tapered shape having a downwardly large diameter. Same as described above. According to the third embodiment, when the mandrel 10 is extracted after the predetermined pressurizing process is completed, and when the mandrel 10 is extracted and handled, the mandrel 1 is removed.
Since 0 is tapered, the product can be prevented from falling down.

Also, including the embodiment shown in FIG. 4, the mandrel 10 and the rubber mold 9 can be inserted and removed together with the lower punch 7, so that the filling of powder can be made offline.
The powder packing density can be improved by adding a tapping process or the like. Furthermore, all of the above embodiments relate to a plate-shaped product forming apparatus, but the ratio of the thickness to the length / width is high, and the block-shaped (such as rectangular parallelepiped) rather than the plate-shaped product is used. The present invention can also be applied to a molding apparatus for molding a product.

[0026]

As described above in detail, according to the present invention, high productivity and high precision of a plate-shaped or block-shaped product using a dry-type CIP device can be realized.

[Brief description of the drawings]

1A and 1B show a first embodiment of a plate-shaped or block-shaped product forming apparatus according to the present invention, wherein FIG. 1A is a vertical sectional view, FIG. 1B is a sectional view during handling, and FIG. (D) is a DD arrow diagram of (B).

FIG. 2 is an elevational sectional view showing a second embodiment.

FIG. 3 is a plan view showing another example of the mandrel.

FIG. 4 is an elevational sectional view of a main part showing a third embodiment.

FIGS. 5A and 5B are plan views showing other two examples of the mandrel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Forming apparatus of plate-shaped or block-shaped product 3 Pressure vessel 6 Upper punch 7 Lower punch 10 Mandrel 12 Flat part 13 Processing chamber 14 Powder

Claims (5)

[Claims] A processing chamber surrounded by a rubber mold and upper and lower punches is provided with a detachable mandrel, and two or more flat portions are formed on the outer periphery of the mandrel, and the flat portion and the rubber mold are combined. A plate-shaped or block-shaped product characterized by defining two or more plate-shaped or block-shaped processing chambers, and pressing the powder filled in the processing chamber under isostatic pressure through a rubber mold. Molding equipment. 2. The plate- or block-shaped product forming apparatus according to claim 1, wherein the flat portion formed on the outer periphery of the mandrel has a curved surface shape or a groove shape. 3. A plate-shaped or block-shaped product according to claim 1, wherein a contact portion of one or both of the upper and lower punches with the powder is constituted by an elastic spacer. apparatus. 4. The apparatus for forming a plate-shaped or block-shaped product according to claim 1, wherein the mandrel has a downward tapered shape having a large diameter. 5. The apparatus for forming a plate-shaped or block-shaped product according to claim 1, wherein a mandrel together with a rubber mold and a lower punch can be inserted into and removed from the processing chamber.